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文章分析了我国套管在工程和计算中的现状,评述了美、苏两国采用的套管抗挤计算公式的理论依据、变化情况、应用条件以及存在的问题。文章进一步从理论上分析了除厚壁管以外的椭圆管受水力外压的破坏性质是一种结构失稳定向问题,而且是弹塑性结构失稳,计算其耐压能力只能用稳定方法而不能用强度方法。文章指出,采用布尔加可夫—萨尔基索夫公式来计算椭圆管的耐外压能力,在理论上有误,计算误差较大。
This paper analyzes the current situation of casing in engineering and calculation in our country, and reviews the theoretical basis, change, application conditions and existing problems of casing extrusion resistance formula adopted by the United States and the Soviet Union. The article further theoretically analyzes the failure of elliptical tube except thick-walled tube subjected to hydraulic external pressure is a structural instability orientation, and is the instability of the elastoplastic structure, the calculation of its pressure-resistant ability can only use a stable method Can not use strength method. The article points out that using Bulgakov-Sarkisov formula to calculate the resistance to external pressure of elliptical tube is theoretically wrong and the calculation error is large.